7. d1a4  7... c7c6 The pawn on g2 is still impossible to protect, but Caruana has an idea. 8. e2e4 The position looks good for White now. If Black takes on g2, then the knight goes to f5 and later to d6. But Keymer finds a wonderful move. 8... g7g5 Black suddenly explodes the position with exotic pawn tension in the center and on the flank. The pawn chain is impossible to sustain, and Black emerges from the complications with an excellent position. 9. g3f5 The best decision.